Features of wireless communication 4g sim card router

Posted by E-Lins Technology on November 23rd, 2020

E-Lins’ 4g sim card router can also be used as data Transfer unit (DTU), which is a wireless terminal device specially used to convert serial Data into IP Data or convert IP Data into serial Data for transmission through wireless communication network.

For example, E-Lins H685 series 4G router with Ethernet is a compact, ruggedized 3G/4G/LTE cellular networking solution designed for mission-critical connectivity in the most challenging environments. It is qualified for M2M (Machine to Machine), IoT (Internet of Things) and In-Vehicle applications. Super mini size suitable for embedding applications.

Functional features:

1. Internal integration of TCP/IP protocol stack

GPRS 4g sim card router DTU internally encapsulates PPP dial-up protocol and TCP/IP protocol stack and has an embedded operating system. From the perspective of hardware, it can be seen as the combination of embedded PC and wireless GPRS MODEM. It has the function of GPRS dial-up Internet and TCP/IP data communication.

2. Provide bidirectional conversion of serial data

GPRS 4g sim card router DTU provides serial communication interface, including RS232 and RS485, RS422, etc are the commonly used serial communication mode, and GPRS DTU serial data into mostly on the design "transparent conversion" approach, that is to say, GPRS DTU can transform a serial port on the original data into TCP/IP packet transmission, and don't need to change the original data communication content. As a result, GPRS DTU can be connected to a variety of user devices that use serial communication, and no changes are required to the user devices.

3, support automatic heartbeat, keep online forever

Is one of the advantages of GPRS communication network support GPRS terminal equipment permanently online, so typical of 4g modem router DTU are designed to support the permanent online function, which requires the DTU contains the heartbeat packets on electric automatic dialing, use to maintain permanent online (when long time data communication, mobile gateway connect DTU disconnected from center, heartbeat packets is DTU with data center to send a small data before the connection is disconnected, to keep connection is disconnected don't), automatic reconnection, the bolt support automatic dialing, etc.

4, support parameter configuration, permanent save

As a kind of communication equipment, GPRS DTU is widely used. In different applications, the data center IP address and port number, serial port baud rate are different. Therefore, GPRS DTU should support parameter configuration and save the configured parameters in internal permanent storage devices (generally FLASH or EEPROM, etc.). Once powered on, it will automatically work according to the set parameters.

5. Support setting of user serial port parameters

The serial port parameters of different user devices are different. When DTU connects the serial port of user devices, the DTU terminal should be set according to the actual parameters of the serial port of user devices to ensure the normal communication and reliable data transmission of user devices.